生物固体衍生溶解有机物对土壤中正酸盐吸附的影响取决于粘土矿物学和溶液成分
Yaniv Freiberg1,2, Pinchas Fine3, Mikhail Borisover3
1Institute of Soil, Water and Environmental Sciences, Volcani Center, ARO, P.O. Box 15159, Rishon LeZion, 7528809, Israel. yaniv.freiberg@mail.huji.ac.il.
Environmental science and pollution research international
|October 18, 2023
概括
溶解有机物 (DOM) 根据土壤粘土类型和溶液化学不同影响无机 (IP) 吸附. 在含有NaCl但不含CaCl2的伊利特/斯麦克提特土壤中,DOM增强了IP吸附,而在高酸土壤中则减少了它.
科学领域:
- 土壤科学 土壤科学
- 环境化学环境化学
- 地质化学 地质化学
背景情况:
- 来自生物固体的溶解有机物 (DOM) 影响土壤中的无机 (IP) 吸附,影响IP的生物可用性.
- 粘土矿物学,溶液组成和DOM对IP吸附的影响之间的相互作用仍然不清楚.
研究的目的:
- 调查DOM对IP吸附对具有不同粘土矿物质的半干旱土壤的DOM的影响 (伊利特/斯麦克提特与考利尼特).
- 确定背景电解质组成 (NaCl与CaCl2) 如何影响DOM-IP相互作用和吸附.
主要方法:
- 在五个半干旱土壤上测量了IP吸附异温度 (以伊利特/斯麦克提特或高酸盐为主).
- 实验是在NaCl或CaCl2背景溶液中进行的,有或没有DOM添加.
- 兰慕尔模型被用来确定吸附能力最大值 (SMAX).
主要成果:
- 在伊利特/斯麦克提特 (I/S) 土壤中的IP吸附能力 (SMAX) 与CaCl2相比,与NaCl相比显著更高.
- 在NaCl中,DOM增加了35-59%的I/S土壤IP吸附,但在CaCl2.2中没有影响.
- 在Na+主导的溶液中,DOM对I/S土壤的吸附比Ca2+主导的溶液要大.
- 考利尼特土壤SMAX不受电解质或DOM的影响;IP添加减少了DOM吸附到考利尼特.
结论:
- 双价 (Ca2+) 和单价 (Na+) 在DOM-IP相互作用和吸附到I/S土壤中起到截然不同的作用.
- 拟议的机制包括Ca2+介导的DOM-IP复杂化和因I/S土壤的Ca2+溶液中的血小板聚合而导致的DOM吸附减少.
- DOM与IP在kaolinitic土壤上的吸附点上竞争,减少了IP的吸附.
相关概念视频
Factors Affecting Solubility
33.5K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.5K
Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism
314
Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
314
Common Ion Effect
41.8K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
41.8K
Solubility Equilibria: Overview
694
When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
Solubility is important in biological and environmental processes. A notable...
Solubility is important in biological and environmental processes. A notable...
694
Ionic Strength: Effects on Chemical Equilibria
1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.5K
Extraction: Effects of pH
509
Consider a neutral form of an amine, B, with a partition coefficient, K, in a liquid mixture containing organic and aqueous phases. The pH of the aqueous phase affects the charge on acidic and basic solutes, and the charged form is usually more soluble in the aqueous phase. Suppose the conjugate acid form of the amine is soluble only in the aqueous phase while the base form is soluble in both phases. Then the distribution coefficient, D, can be given as the ratio of amine concentration in the...
509


